Links-Works Cited

https://www.cia.gov/library/publications/the-world-factbook/flags/flagtemplate_su.htm sudanese flag
https://www.cia.gov/library/publications/the-world-factbook/geos/su.html general information, location, topography, etc.
http://globalis.gvu.unu.edu/indicator_detail.cfm?Country=SD&IndicatorID=13 ecological footprint
http://deepblue.lib.umich.edu/bitstream/2027.42/37574/1/1330460316_ftp.pdf fossil record, nubia